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An update will break any worries, the course of the lines of file continu and database recording is effective.

However when it comes to inserting a new object I get an error :
" org.springframework.dao.DuplicateKeyException: a different object with the same identifier value was already associated with the session: [fen.NuisanceType#2202]; nested exception is org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session"

The registration of the object in question is effective , but the error raised off the path of the file.

When i uncommented the "try and catch" I bypasses the error and so all my copies of each file are created in the database .

I thus found a way around my worries, but I do not find it very clean and i come to you to try to understand my problem.